Dial control



Snom/pto@ H. R HAYDEN DIAL CONTROL Originalild June 5, 1927 Dea. 3, M929.

Patented nee.. s, 1929 HARLJD R. HAYDEN, UF BROOKLYN, NEW YRK, ASSGLNOR 0F UNE-LF T0 BAH E. VAN DORJEN"` l DIAL CUNTRL @riginal applieatonledl .Tune a, 1927, Serial No. 196,244. Divided and this application led epternber 26, 1928. Serial No. 309,t82.

'lthis invention relates to radio receiving apparatus and more particularly to dials or indicating1 devices,A such as are employed for tuning the system to receive desired incoming signals.

llhe principal objectot my invention is to provide aA radio receiving apparatus with a dial having the indications thereon formed of luminous material visible in the darlr.

lllleretotore in order to illuminate dials on radio receivingq sets it has been customary to employ miniature electric lamps which are connected in circuit to the source ot the current which supplies the vacuum tubes ot the set. When the lamp is connected in series with the vacuum tubes the system can be operated only when the lamp is illuminated and on :tailure ot the lamp the system ceases to shunt to the tube circuits switching' lon oi' ott oi' the lamp or iailure oit the lamp is apt to cause changes" in the voltafreapplied to the tube circuits Whichinterteres with the efficient operation ot the system. By the use or a dial provided with luminous characters i or connections the disadvantages above noted 3T@ OVGTCOme.,

1While l am aware that it has been pro-- posed to apply luminous material to various devices tor the purpose ot rendering?J them visible in the dark, l am unaware that luminous material has ever been employed on the dials ott radio receiving,n sets above described. y

lthe specitie iteatures ot my invention relate to the Yparticular markings and arrangement ot markings ot luminous material on the dial with a view to permittinga ready and accurate reading' oit the dial setting", to the protection of the luminous material :troni dirt and wear and also to features ot construction as will be more particularly point ed out hereafter. Also, other objects and advantages orn my invention will appear from the following de scription taken in connection with the accompanying drawingr wherein.:

ltigurc l isa trout elevationot one torm ot dial embodying' my invention,

ltligure 2 is a vertical transverse sectional viedw ot the structure shown in Figure l an Figure 3 isa detail view showing the torni and relative arrangement ot certain ot the parts shown in Figures l and 2, one ot these parts having marked thereon call letters ont broadcasting stations.

rlhe dial shown in the drawing comprises a casing l0, consisting of a tace plate ll, and a back plate l2, adapted to be secured tothe tace plate by screws 13. 'lFhe baclr ot tace plate is recessed so as to provide 'a space or chamber lll. inside the casing; l0. The back and tace plates et the casing" 10 are pro vided with central openings l@ and il., respectively, which torm bearings tor a rotary collar 18, to which is secured a semi-circular plate 20. located in the space lt. llo-tation of the collar i8, serves to rotate the plate 2O and bringthe numbered giaduations 227 on the peripheral margin of the dial plate into view through an openingT 2d, termed in the upper part ot the tace plate il. 'lthe upper wall of the openingf 24 is termed with a downwardly tapered projection 23u which serves as a pointer to indicate the position ot the dial 20. rlhe s rraduations 22 are marked on the plateQU with luminous paint so as to be visible in the dark.

Extending1 through the collar lil, and

.adapted to be actuated thereby, is a sha-tt 25,

engages the'shatt 25.

Secured to the bushing1 2'? is a pointer or arm 3l which is adapted to cooperate with a segmental strip 32, upon which may be vmarked indicia, such as the call letters d() indicatinu different broadcasting' stations. Strip S2 is set into the :tace ot the plate il, as/ shown in section in Figure Q., and is formed with a suitably roughened outer surface so 'lll 9U which passes through the lrnob and collar and i i -l th'at-it may be'easily marked. The surface of band36, visible in the dark. The pointer 31,

extends over the band 36, and hides from View -a small portion of the band. By observing what-- ortion of the band 36, is hidden from view y the pointer 31, it is possible for an operator in the dark to estimate the angular position. of the pointer or the adjustment of the condenser. This is of considerable assistance in case the numbers on the dial 20 cann'ot be accurately read. An operator can easily ascertain the position of the stationary y .pointer 23, relative to some number on the mov'able'dial 20, and by observing the position of the movable pointer over the band 36, he can judge accurately what the number is.

It is to be noted that luminous material which forms the markings on the dial 20, be-

ing enclosed in the casing 10 isprotectd from dirt and wear. l

The face plate 11 is formed with a top proj ecting portion 38 having an opening 29 therethrough, adapted to receive a screw 40 for securing the casing 10 to the front panel of the cabinet. e

This application is a division of my copending application, Serial Number 196,244

filed June 3, 1927. v i p `'Having now described my invention, what claim and desire to secure by Letters Patent 1. A dial control comprising a stationary plate, a rotary member .mounted in said plate,

a pointer secured to said member and movable over said plate and a band of luminous -material on said plate, located behind said pointer.

2. A dial control comprising a casing having a chamber therein, a member rotatably mounted in said casing, la dial in saidchambei', movable with said member, and having graduations thereon formed of luminous material, said easing being formed to render visible from the outside graduations on said dial, a pointer secured to said member and movable over the outer face of said casing, means forming a surface upon which the dial indications may be marked, said means being adapted to cooperate with said pointer to indicate the position of said member and an arcuate band of luminous material von said casing behind said pointer.

3. `A dial control comprising a rotary member, a" dial and pointer movable with said member, a'stationary pointer cooperatingwith said dial to indicate the position of said member and a stationary dial cooperating with said movable pointer to indicate the position of said member.- V

, 4. A dial control comprising a rotary member, a dial and pointer movable with said member, alstationary pointer cooperating yw1th said dial to indicate the position of said member, a stationarydial cooperating with said movable pointer and indicia of different kinds on said respective dials.

5. A dial control comprising a casingliaving a chamber therein, a member rotatably mounted-in said casing, a graduated dial in said chamber secured to and movable'with said member, the Wall of said casing being formed with an opening to render visible, graduations on said dial, and a pointer secured to said member and movable therewith, outside said casing, the outside of said casin being formed with an arcilate portion adapted to cooperate with said pointer to indicato the position of said member, said portion being formed with a surface which may be easily marked. j

6. Ina dial control, a face plate, a'member rotatable relative to said face plate, a graduated dial behind said face plate, secured to and movable with said member, said face visible graduations on said dial, a pointer secured yto said member and movable therewith in front .of said face plate, said face plate being formed with an arcuate portion adapted to cooperate with the ointer to indicate the position:` of said mem er and call letters of different broadcasting stations along said arcuate portion.

7. In a dial control, a rotary shaft, a hub adjustably mounted on said shaft, a dial rigid with said hub and covering substantially 180 of arc; an arm .rigid with said hub and extending from Said shaft in a direction opposite to the. radius intersecting said arc at its centre and stationary means cooperating with said dial and armto ermit adjustment of said shaft to the desired) angular sett-ing.

8. In a dial control aface plate, a rotary shaft extending outwardly through said face plate, a hubon said shaft extending outwardly throughsaid face late, a dial` rigid with said `hub, positioned ack of said face plate, afpointer rigid .with said hub, posivtioned in front of said face plate, said dial covering substantially 180 of arc and said pointer extending from said shaft in a direction o posite to the radius intersecting said arc at lts centre, said face plate being formed with an opening to permit graduations on said dial to be visible through said face plate, and means cooperating with said ointer to. permit adjustment of said shaft to t 1e desired angular setting. .V

9. In a dial control a face plate, a rotary shaft extending outwardly through said face plate, a hub on.said shaft extending outwardly through said face late, a dial rigid with said hub, positioned ack of said face plate, an arm rigid with said hub, said dial covering substantially 180 of arc and said armvextendinor from said shaft in a direction opposite to the radius intersecting said arc at'lts centre, said face plate being formed plate being formed with,an opening to render .secured to and movable with said member,

said dial having position indicating means thereon, .the wall of said casing above said rotary member being formed with an opening to render visible the indicating means on said dial, an arm secured to said rotary member and movable therewith, said casing being formed beneath said rotary lmember with an d arcuate portion and a plurality of means along said arcuate portion cooperating with said arm for the positioning of said dialat diiferent settings.

Signed at New York, in the countyV of Kings and State of New York this 25th day ofSeptember, A. D. 1928.

HAROLD R. HAYDEN. 

